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Mongo2SqlLite.go
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Mongo2SqlLite.go
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package main
import (
"fmt"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"log"
"strconv"
)
type MongoGame struct {
_Game__id string
_Game__title string
}
func MigrateMongoToSqlLite() {
session, err := mgo.Dial("127.0.0.1")
log.Print("Migrating from old MongoDb datasource to Sqlite3...")
if err != nil {
log.Fatal(err)
}
defer session.Close()
MigratePlatforms(session)
MigrateGenres(session)
MigrateHardwareTypes(session)
MigrateGames(session)
}
func MigratePlatforms(session *mgo.Session) {
result := mongoGetCollectionContents("platforms", session)
var ps []Platform
for _, doc := range(result) {
var p Platform
p.Name = doc["_Platform__name"]
p.Description = doc["_Platform__description"]
ps = append(ps, p)
}
for _, p := range(ps) {
r, err := GetPlatformByName(p.Name)
if err!=nil {
log.Fatalf("Error while retrieving platform %s: %s", p, err)
}
if r.Name!=p.Name {
log.Printf("Could not find platform %s; adding it.", p)
err = AddPlatform(p)
if err!=nil {
log.Printf("Error while adding platform %s: %s", p, err)
}
}
}
}
func MigrateGenres(session *mgo.Session) {
result := mongoGetCollectionContents("genres", session)
var gs []Genre
for _, doc := range(result) {
g := Genre{}
g.Name = doc["_Genre__name"]
g.Description = doc["_Genre__description"]
gs = append(gs, g)
}
for _, g := range(gs) {
r, err := GetGenreByName(g.Name)
if err!=nil {
log.Fatalf("Error while retrieving genre %s: %s", g, err)
}
if r.Name!=g.Name {
log.Printf("Could not find genre %s; adding it.", g)
err = AddGenre(g)
if err!=nil {
log.Printf("Error while adding genre %s: %s", g, err)
}
}
}
}
func MigrateHardwareTypes(session *mgo.Session) {
result := mongoGetCollectionContents("hardware_types", session)
var hts []HardwareType
for _, doc := range(result) {
ht := HardwareType{}
ht.Name = doc["_HardwareType__name"]
ht.Description = doc["_HardwareType__description"]
hts = append(hts, ht)
}
for _, ht := range(hts) {
r, err := GetHardwareTypeByName(ht.Name)
if err!=nil {
log.Fatalf("Error while retrieving hardware type %s: %s", ht, err)
}
if r.Name!=ht.Name {
log.Printf("Could not find hardware type %s; adding it.", ht)
err = AddHardwareType(ht)
if err!=nil {
log.Printf("Error while adding hardware type %s: %s", ht, err)
}
}
}
}
func MigrateGames(session *mgo.Session) {
result := mongoGetCollectionContents("games", session)
var gs []Game
for _, doc := range(result) {
g := Game{}
g.Title = doc["_Game__title"]
mongoGenreName := doc["_Game__genre"]
genre, err := GetGenreByName(mongoGenreName)
if err!=nil {
log.Printf("Error while retrieving genre with name %s. Aborting import of %s: %s", mongoGenreName, g, err)
continue
}
g.Genre = fmt.Sprintf("%d", genre.RowId)
mongoPlatformName := doc["_Game__platform"]
platform, err := GetPlatformByName(mongoPlatformName)
if err!= nil {
log.Printf("Error while retrieving platform with name %s. Aborting import of %s: %s", mongoPlatformName, g, err)
continue
}
g.Platform = fmt.Sprintf("%d", platform.RowId)
mongoNumberOfCopies := doc["_Game__num_copies"]
g.NumberOwned, err = strconv.Atoi(mongoNumberOfCopies)
if err!=nil {
log.Printf("Error while parsing number of copies %s. Aborting import of %s: %s", mongoNumberOfCopies, g, err)
continue
}
mongoNumBoxed := doc["_Game__num_boxed"]
g.NumberBoxed, err = strconv.Atoi(mongoNumBoxed)
if err!=nil {
log.Printf("Error while parsing number boxed %s. Aborting import of %s: %s", mongoNumBoxed, g, err)
continue
}
mongoNumberOfManuals := doc["_Game__num_manuals"]
g.NumberOfManuals, err = strconv.Atoi(mongoNumberOfManuals)
if err!=nil {
log.Printf("Error while parsing number of manuals %s. Aborting import of %s: %s", mongoNumberOfManuals, g, err)
}
g.DatePurchased = doc["_Game__date_purchased"]
mongoApproximatePurchaseDate := doc["_Game__approximate_date_purchased"]
if mongoApproximatePurchaseDate=="" {
mongoApproximatePurchaseDate = "False"
}
g.ApproximatePurchaseDate, err = strconv.ParseBool(mongoApproximatePurchaseDate)
if err!=nil {
log.Printf("Error while parsing approximate purchase date %s. Aborting import of %s: %s",
mongoApproximatePurchaseDate, g, err)
continue
}
g.Notes = doc["_Game__notes"]
gs = append(gs, g)
}
for _, g := range(gs) {
existingGames, err := GetGamesByNameAndPlatform(g)
if err!=nil {
log.Printf("Error while checking if %s exists. Aborting import of %s : %s", g, g, err)
continue
}
if len(existingGames)==0 {
log.Printf("%s not found; adding.", g)
_, err := SaveGame(g)
if err!=nil {
log.Printf("Error while import game %s. Aborting import of %s: %s", g, g, err)
continue
}
}
}
}
func mongoGetCollectionContents(collectionName string, session *mgo.Session) []map[string]string {
c := session.DB("GamesCollection").C(collectionName)
var result []map[string]string
err := c.Find(bson.M{}).All(&result)
if err!=nil {
log.Fatal(err)
}
return result
}